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CVE-2026-34003

Xorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access

No known exploitation. EPSS puts it in the 16th percentile. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile16th0.3% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products7 fixed builds listed below
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OpenVAS · 97 checks

e.g. OID 1.3.6.1.4.1.25623.1.1.10.2026.0155

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Red Hat Enterprise Linux 10Fixed builds0:24.1.5-6.el10_1, 0:21.1.3-20.el8_10, 0:1.15.0-6.el9_7.1Stated by: CVE record
  • Red Hat Enterprise Linux 10.0 Extended Update SupportFixed builds0:24.1.5-6.el10_0Stated by: CVE record
  • Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONFixed builds0:1.1.0-25.el6_10.16Stated by: CVE record
  • Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed builds0:1.20.4-34.el7_9Stated by: CVE record
  • Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed builds0:1.20.10-4.el8_4Stated by: CVE record

Versions as the sources state them. 13 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS16th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.3% chance of exploitation activity in the next 30 days, which ranks it in the 16th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

16 events over 195 days, from the signal feeds we watch.

  1. Patch availableworkaround available, record updated
  2. Patch availableworkaround available, record updated
  3. Patch availableworkaround available, record updated
  4. Patch availableworkaround available, record updated
  5. OpenVAS check added
  6. Publishedweakness classified, att&ck mapped

Affected products

And 12 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 40 more references. See all after sign-in

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